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Simplify each of the following logarithmic expressions, giving the final answer as a single fraction. a) log 24 b) log 84 c) log 2 24 ( ) d) 5 1 log 125 1 2, 3 2, 3 4, 3 2 −
On a calculator it is the "log" button. It is how many times we need to use 10 in a multiplication, to get our desired number. Example: log(1000) = log 10 (1000) = 3
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We use can logarithms to solve exponential equations: = b is x = log a bFor example, the solution of ex. 2 is x = log e 2. To find the value of this logarithm, we need to use a calculator. log e 2 = 0.6931.Note Logarithms were invented and used for solving exponential equations by the Scottish baron John Napi.
After reading this text and / or viewing the video tutorial on this topic you should be able to: explain what is meant by a logarithm. state and use the laws of logarithms. solve simple equations requiring the use of logarithms.
Mathematics Learning Centre. Logarithmic Functions and the Log Laws. Christopher Thomas. c 1998. University of Sydney 1 Logarithms. 1.1 Introduction. Taking logarithms is the reverse of taking exponents, so you must have a good grasp on exponents before you can hope to understand logarithms properly.
